3D Sonic the Hedgehog is a port of the original Mega Drive game for the Nintendo 3DS. It was developed by M2 and released digitally in 2013 as the third entry in the 3D Classics series of 3D ports of retro Sega games for Nintendo 3DS, and in celebration of the twenty-fifth anniversary of the Sega Mega Drive.
It was later released on Sega 3D Classics Collection in 2016. As part of the Sega Ages series for Nintendo Switch, a follow-up to the 3D Classics series, Sega Ages: Sonic the Hedgehog was released in 2018.
The main notable new feature is the inclusion of the Spin Dash, however, Sonic can still be damaged while charging the move. Other features include Level Select available from the start, filters, customizable controls, different sound options and options to play in Japanese (Rev. 01) or International (Rev. 00) modes.